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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af9701ffff73702572be45508d412c6a2fea0eae06a205306d62e65ef3810c27' 
  AND token = '0aibuyGsQG0zbjUefBLXIQI5m1JUI8H8HdqKcLstMys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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