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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e7c574803c5344f4688cdba5d01976cdaa3f428097a92ec0b4c19ada138546b9' 
  AND token = 'daqv/1lc3OVUZ86qBxwInIDGr3tvcJaa7bqei6jHRCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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