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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c04957c9279bcecd1064617319ddbfe8c8a50f228c07f281f44c43740753b476' 
  AND token = 'rItaEQ3FagRRajGK3OKpe3r9wj8t7McaIrYCA6bafpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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