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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd89d08b610e1dd111f0e3fc5a085eb989360e7b2efc2ffc35ec8d04e109319bf' 
  AND token = '5ohpUNVm54THeUfydlVkjlsIEa7jaEjoiyoART1RiwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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