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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94f825d7bbc52e77bff632996eb3b50fb3494d3c699eb1e797bd1a72a8c239ac' 
  AND token = 'jl0Z1elpret7UmR4pGlJxvRWGkawY2P6WzV0ToQvuOc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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