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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f979996952ab0412c83075bbe3fa31164d25efb360ea4437f962fed5117e5656' 
  AND token = 'QZiTbjnr+2UXbttRe1LhX5uG0tm5K7LEgrdW0YX9zSg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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