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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b96e426981935fabdc0b22e406771d784766743403e6dc6bd662c41f68ba9de' 
  AND token = '8Nbia11RRcoAReYi6T4nThvpCVLc5QTtD4VauBRqKgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00151

JSON explain

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