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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1c655714611993278d5c6b7e375a05df147193b4aa5649e9d961d7fec838196' 
  AND token = '7fSc7vHDBgob+/TYDMzaS5i/6CP2UxnlBvOq4TN1TRs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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