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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7029da1ba86ed0739a9fbd54f7a7afbba1042aff8c40aba0a35bec259175475' 
  AND token = 'N4nvVtKO1ABH+qPVUKxwbueqFyhS9co8BAmIURigEr8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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