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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b742b834b600ae1fec15186d20ab50c79cce35f382a2d3e4c2248971b29bd60' 
  AND token = 'yjBcx0I9A3gyCOP7uZaP7gTaZhM46baAIsPgU0L77Tc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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