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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b01c9e44723eeb822ace774d29057117cae240f23f454e99bca9c467b6336a42' 
  AND token = 'qPtHV7rIgP6Tp8wySzPTGuDAPoCgriLc0q/7Fr+chdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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