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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f689e0d6813b408ceabcf393ebd347714d1d84a9ef0fd6e13028d4cbb7b4d0ed' 
  AND token = 'u7b2A6anyFuiT+kb2tEhz8r2e5MpAxpQqr2SmUGdGNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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