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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb1cc077603582974bdad5346edc2f2dd82477269390697684e52bea0fdd760b' 
  AND token = 'MmqD9Zqhbx6sVc1OCd9t0xOo+wtF2LanRXPY+90X564=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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