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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '419cb97b5c72f1ba9f8fe544410e2cc949f5f60be34f0b1eb5ae14f61040d8b5' 
  AND token = 'N7POPESay702dfLSp8uvxhmwPP8BVH6bXLP5xZYgzM8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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