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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64a4929541bfa2115ac063069fbdac5eccdc995629680c9f99efab6992f7527c' 
  AND token = 'b8wHAcXzHTy69TkWppffE/FMST4VyjMvxsmGHj37Wqs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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