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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7b91a348805ff4e4d10ec88b64aaddcbedcbdf9f279998873e5ae9472ef7a72' 
  AND token = 'Tp7OdhvDjG5RkhEgxb74LKbLZZnfWdv23fmp+GLhLos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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