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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f0359e34ff2b8be332c0684ae52ca9caf6e4b5ee39cd0b8c47be396b162cad4' 
  AND token = 'NlXE60JSJxWzUGp+oplh2J2EgspYikOxphhiYDPnVrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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