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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f606e1365fb7a82ea42ef46050165664c89210803ee23fcf2e1910db27ae430d' 
  AND token = '8vGKLQ0gZjbjDYAg7BwKv/0liHvxkw0vkNi5P/4PBZk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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