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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e5efc7abf4918946dcb9c65539ea697269cc13e158e12e27d001637836fae31' 
  AND token = 'U78U2EKq4Eb9uazScM18n0oXfV7giDcIdGt9g/I+EuU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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