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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae28d7c7b83ea858d5bcf8da1c4c3768aea1197bfa5ecd074d2b97667cf1b871' 
  AND token = '5Dw4JQxkdYVDpHplUlVWGo/ayGtmud9e496lTvy7z20=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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