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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '438924d4c82463489b31467f83002362edd7f0d1a3d32b5898d59491eac5382c' 
  AND token = '/Z4i7BV0ivkMNtOeYjRhkNWKZXvAW3ayqY8hz789vCE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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