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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cb7646d5730f45e72e347d2c6ca627a8c5cf5c5ee9f52593b2fd54a4fff22dfa' 
  AND token = 'eJry/BecCgansIWzsoLyKJie6kgDOFPpU6qpS7x1csk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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