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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b636db1b733b69d5e708b24f014734040dae1b8a169ec4d9c6e330355cae6344' 
  AND token = 'q7ICFJpfnOLUqLU157QEr9yT2sAVH1RtLZYMCun84aM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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