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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23e3a0ba4e4dcd7d477af3dddfa1b10c3fff5090d269cd3ac8b1ac2ce06a7742' 
  AND token = 'waUnGjI/wwIzHFZq13OmJ12oMW6aJrsryFtmmPVAj5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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