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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '730895e009d2ccedf5fe7100651502b2e4bc44225d3f11874d47bbd43a0977d0' 
  AND token = 'rz/cx6u5knz03ALRL6WBWv6iY/585snKRlD/e9wBuw8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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