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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '022b63ef36236c87d14cbf701e376ef2a5f7b8a9ffa95f8532798892297fc5bb' 
  AND token = '4Qf4NHuh+xw+eHcea6ywoAOx3wNBKBioJSKcT+T2heU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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