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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f42295cf8a4c1da31d618c560c5eb641d829d784854ca47b5dcdf6c5fe2e54ca' 
  AND token = 'HRwQOPrnNNpwBv/CenNgqQNlcWd3CKBa05LAhDr8dJM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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