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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '76269bff93c90917e8bd534cb0c9b3f29fb362697c24a3c18b0ae23f3ae7b3b8' 
  AND token = 'ec9ZZCpEZL3Q3dHVmqolWLloaP8rNuPIUge+gBZyyVE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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