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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ed3fb85b07199c37c94830f98316012125f29c30116d42c0d830efc1bc66940' 
  AND token = '9vQY8c4H+5j4n0eFuzEOCOgkMvc6zmn/r4k5FabeVbw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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