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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4f4d4ebd7faa091e12c01e93461c776ca24bdfecf6eab3dbfe9cbe81d1d0c71' 
  AND token = '9RRwtV3qCDJ0FvJAaZbBxm/kPICy4E0n/WulV2ZDDow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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