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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f6dc9c68a493796e1ea1654c31ada252dfdf4ab41a92e674ba535e0dbc04150' 
  AND token = 'K4PcC6Y4C+vgPDacQNUmeClm1WmtTiSQsUClMXnIlkc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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