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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63885a314e06dc3ad5a40faaef1e991edca8440956b9962cab208b693c716637' 
  AND token = 'C4X1iQUtjBFTuWB6+cCGzRWkff9DB7CGzdEgMPmC7L0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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