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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '552c14e47977bafeeaee688e2b4ee1aef908b96c93e1a2c1abb61b9a66e5de8f' 
  AND token = 'tr8uGWJtMfBWSktcAhlcpdJR26O07W47OKR5uZCB/BM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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