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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd66621eba271d55dacebc61a0057e2bdf76e2bb0bee189909442b69f99a3d1cd' 
  AND token = 'RFvf5xMUpaidw9huG5oSvlDF6cu2wvxsJFQ5/QFIQSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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