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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcfaeef81b1420c4da91849406b3df92072e1b0af48a72da26624367775e0453' 
  AND token = 'IVLILC1kGfI7HQCQik/HqlHmKFbY38mGRouMcGKI/L4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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