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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e78cb7d5a548fc7f854b5bff49e1c858b02e0eb272155906cbbc417479523f8' 
  AND token = 'eLF/XMIJN95rIBfZvKnLOUhv7qxG9+e/mDzrqreKfs4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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