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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '853ab191bed6094afae17b913f3a0a47196fa52a44dd0da074e70030cbac1d6b' 
  AND token = 'vXr6vUaiEKBmMDZFvgzhYpcdJ2jzzyMilc7RHVJ5jyI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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