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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e61485ed712463c7b34646fef61e6cc127b6f39bcbdb0960009730c5e2a3c19' 
  AND token = 'dIU/w2yzSasEz2KkYwnN03FnAls/Vb07vfBElAvbuR0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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