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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc0deb07e650cd5a149cf7dd3932a4dca12dc4350d8e95828afbd8bbc542be45' 
  AND token = 'jZXT1C2aklYrndlEF5Avv3BNjZRUAvQ7SLw+pI/lyFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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