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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9405dbd11781c3bb2c7eba48c21a267e7a2f16d65eff5d176ff2ce73279fd6e' 
  AND token = 'aTZ1ysC1OXMpqD1E6lloQy1/jawPrT552dJvpUu+d4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}