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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b1357352ee59a788a6fd0ea890ffe1c5333634eee3f9c747e0c8ccb010a2ebe' 
  AND token = 'Znp1RHTKW6p2hNBvJp9ZdIRbWrjUc7yyCD7Clb3AmxE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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