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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56e2507f907b8e7a6f60baf0ec88b2df3a200eaed2adc2aae8fd73acf15f87b7' 
  AND token = 'dausEtabz0V0t+CSuKVPW2oViHyegluabQXV8/ffqhM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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