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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1de3f8d974e8f868525c9b401d7d852e6cb71a2610165bc1f4518cd3e304a68' 
  AND token = 'oE4xEXPisKe6hg0drCblg57399FCSB10XpO2Y54oreo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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