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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed12e813ba7c59a250d6236522e6996b7609bbf412b64dbe8ab6340509a4b6c2' 
  AND token = 'iFcK4HpRWVjVrmD3jwcMEutQCSwJ++wKYAinfHlQaMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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