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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79ff3896eac5c1c400e4e00f4144a61e201ec8b63e31d7e4c90747251d82e6e6' 
  AND token = 'EXIRu6aV7HmZ8TXjV6MABnwOzs5gYDsTdNCummkKjpc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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