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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36e3ea2e75acdb2c67dbeaf74c1db442eae9e857d3e779326ed2266e2cdd7a90' 
  AND token = 'J9BishNPKqyoh2hcngHVjydLuU7nTmFoiHu+hNarhYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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