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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eab7e2b4dde0687e618b0d3866b97671ae707ec8c5fed474719adb734328d8ca' 
  AND token = 'o8M2t+u7xPJyiyP3LDOYrh1D6uhWO6D7a/FUFJxvYFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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