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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '636f49db00f7d149c1f02ae13bd6eb644590300c2b78daf00b5845d51f466a6e' 
  AND token = 'Sk043c7cie8ntQE1CeTiSM/il47CIEAVXB5IOXsyH4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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