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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b4ab8c96548245f7f6532b1a5900e1c8141558f6d69c8d08383d18e6796d7ad' 
  AND token = 'cbFCo4UvoOTVrlh5yz2bzV16ss0mWBLFJ6n3Mi0ulIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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