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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be4493c55eaea1790a8ab5366bd27df3127f03bbe60e5763d70c269f86dc55bf' 
  AND token = 'Jc9FC2AjrZpkipfoPtwo9Y+3gDSPe4oFhAX1UQPIOEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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