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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '283299a7afb7de586c28e0af8503acd7bf61a900bcc66092187baa10e3d830a2' 
  AND token = 'RkzVN7N9Fit4LkrC5B0AW1boK8rNYXhNX2frWKplCxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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