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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f38b1f3d7ca2352f747a41233fbf80e8860daa80bddfc4dfc3e71d728779d02' 
  AND token = 'JkS9mC9IottwwpCh/jGHF0dplvn8rc6bhqcc/nk5PFg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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