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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f3feddd46e9d0c9b4f1380f3b25eda4ea3ea6a7c6e47d1872a6097b0e955fcc6' 
  AND token = 'gr+2GYbnyQYIxtYyRNrNuu9bYT4MCbKhlV0lJVTXvOg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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