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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7c3312bb10407a09d37234861e13c3c11203dbd48515a79edbc5fa8e85123e7' 
  AND token = 'tvLy0KjHg2pwH94/VfrWT5Mg3HXRg2KlgW5WHn+cIbc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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