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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '17860728a12d5a9ce10b57689fa04769f51b0576c2caf888e2c073443a7d7746' 
  AND token = 'Um6+2qu/1FjavoCRjR4nyN2Fb1SM2LMu1m4jqFRB0qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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