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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a20391d8d07edd0245be5f053b30245143b4016e389c19205f4bb3f02d810ee' 
  AND token = 'h2zU4GtJ1O1bpjAeZTzMR1k/qe8+EAt70wlBh8jlczE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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