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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc43d7b7253eec1150bd3a17f1be1eb58f87e3672509d8ef2ca983b452f59cb8' 
  AND token = 'I7JvwBnT2s1HTbzFsMzQyQKkELc3T543l3xWB69A69I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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