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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7fecad20f29c3ab547d85b47f871c876626279c99e74db6279496a79e486cf2a' 
  AND token = 'VuIBCs6OENc2Px+eId941bi8eaHQHu0qgDkq7dONXhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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