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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '66506aea65de51e7d5241e43b1fd0fce4c69f7dec741a29ba0d3d4fdd4900163' 
  AND token = '1vugpJrud+cEUqTdRDUXgsBKSmLdtIBMPoJ6B1vHAxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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