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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6bcb1049b14ae22de0a5d8c1124de764b4e9a305ccfca09c58d04d791d997d89' 
  AND token = 'wF3DJ7e3HPb/d9bvoRyo8Ea0HTr3Z7JQP1BsVc9iXR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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