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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77591b884f29149253ea82d36e25e08c9150ca14243718eceb743a57d88aef33' 
  AND token = 'TBR6Galumqq3tjlX62YMEHqW+a7T3r/pjZStsSJiG5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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