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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add4299942805e79854daa56966468ad0be6e2d2a42f1182f4e4f8d266a56ffa' 
  AND token = 'OWuQmEXNG4dHSFOLtNiTQDOWBa9oI3N/4Iomqz+YKfs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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