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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd602b2edcd4abb2cc23a659b8fd2a9979672e9ed7f1a9b1cc7ac9082fd4d4d83' 
  AND token = 'kDGU6b7H3xib/NjCldL1H2TvbaPEp7+BcDoTfMFf+hc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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