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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a4c31ab50655269d8a4eb1b731d014f32ac3f35fc04aafd61f235692e5e2e7' 
  AND token = 'Qw1lcktwaaEU/8NjvMgV+HPasoh5thum8z3rIvsfiK8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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