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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf62adbcb0ec93a6cf2b4e71c3787330a86f6a6585776cc90b9d38c683bc5d7d' 
  AND token = 'nBputsbtY0IPCWtELyMtjucCZSD+o4KmpvygOB0U98A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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