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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e174cc32a7a6895e1ef57b273ba772006abd1749c63d0f1ebdf42ed918f7fcc' 
  AND token = 'ZqPOoiQxkDTFyNdx2DGXTsENxSo8aN5BZKT7s9SAmh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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