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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73cda284c59b8c3b15989594e13694ed023737630c4e32025b5992c70630c932' 
  AND token = 'jlQf+iP5hP/FhCc/bRq0B3jn9sY7tYASGl0YYOBvHvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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